/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 20:24:43,069 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 20:24:43,072 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 20:24:43,096 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 20:24:43,096 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 20:24:43,097 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 20:24:43,099 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 20:24:43,100 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 20:24:43,102 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 20:24:43,103 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 20:24:43,104 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 20:24:43,105 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 20:24:43,105 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 20:24:43,106 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 20:24:43,107 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 20:24:43,108 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 20:24:43,109 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 20:24:43,110 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 20:24:43,112 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 20:24:43,113 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 20:24:43,115 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 20:24:43,116 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 20:24:43,117 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 20:24:43,118 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 20:24:43,120 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 20:24:43,121 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 20:24:43,121 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 20:24:43,122 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 20:24:43,122 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 20:24:43,123 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 20:24:43,123 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 20:24:43,124 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 20:24:43,125 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 20:24:43,125 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 20:24:43,126 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 20:24:43,127 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 20:24:43,127 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 20:24:43,128 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 20:24:43,128 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 20:24:43,129 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 20:24:43,129 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 20:24:43,130 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 20:24:43,152 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 20:24:43,152 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 20:24:43,153 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 20:24:43,153 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 20:24:43,154 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 20:24:43,154 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 20:24:43,154 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 20:24:43,154 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 20:24:43,154 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 20:24:43,155 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 20:24:43,155 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 20:24:43,155 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 20:24:43,155 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 20:24:43,155 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 20:24:43,155 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 20:24:43,156 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 20:24:43,156 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 20:24:43,156 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 20:24:43,156 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 20:24:43,156 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 20:24:43,157 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 20:24:43,157 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:24:43,157 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 20:24:43,157 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 20:24:43,157 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 20:24:43,158 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 20:24:43,158 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 20:24:43,158 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 20:24:43,158 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 20:24:43,158 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; [2020-08-18 20:24:43,455 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 20:24:43,470 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 20:24:43,474 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 20:24:43,475 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 20:24:43,478 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 20:24:43,479 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-18 20:24:43,556 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/31fe26420/28cdeab1563b43e7bbbc79fc87385cf5/FLAG49f19e6c7 [2020-08-18 20:24:44,064 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 20:24:44,065 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-18 20:24:44,071 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/31fe26420/28cdeab1563b43e7bbbc79fc87385cf5/FLAG49f19e6c7 [2020-08-18 20:24:44,476 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/31fe26420/28cdeab1563b43e7bbbc79fc87385cf5 [2020-08-18 20:24:44,484 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 20:24:44,486 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 20:24:44,487 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 20:24:44,487 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 20:24:44,491 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 20:24:44,492 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:24:44" (1/1) ... [2020-08-18 20:24:44,495 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5e06715f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:44, skipping insertion in model container [2020-08-18 20:24:44,495 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:24:44" (1/1) ... [2020-08-18 20:24:44,503 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 20:24:44,522 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 20:24:44,714 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:24:44,722 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 20:24:44,743 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:24:44,762 INFO L208 MainTranslator]: Completed translation [2020-08-18 20:24:44,762 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:44 WrapperNode [2020-08-18 20:24:44,763 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 20:24:44,764 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 20:24:44,764 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 20:24:44,764 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 20:24:44,858 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:44" (1/1) ... [2020-08-18 20:24:44,859 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:44" (1/1) ... [2020-08-18 20:24:44,868 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:44" (1/1) ... [2020-08-18 20:24:44,869 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:44" (1/1) ... [2020-08-18 20:24:44,878 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:44" (1/1) ... [2020-08-18 20:24:44,884 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:44" (1/1) ... [2020-08-18 20:24:44,886 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:44" (1/1) ... [2020-08-18 20:24:44,888 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 20:24:44,889 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 20:24:44,889 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 20:24:44,889 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 20:24:44,890 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:44" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:24:44,967 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 20:24:44,967 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 20:24:44,967 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 20:24:44,968 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-18 20:24:44,968 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 20:24:44,968 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 20:24:44,968 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 20:24:44,968 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 20:24:44,968 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 20:24:44,969 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 20:24:44,969 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 20:24:44,969 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 20:24:44,969 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 20:24:44,969 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 20:24:44,969 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 20:24:44,970 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 20:24:44,970 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 20:24:45,218 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 20:24:45,218 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 20:24:45,223 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:24:45 BoogieIcfgContainer [2020-08-18 20:24:45,223 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 20:24:45,225 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 20:24:45,225 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 20:24:45,228 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 20:24:45,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:24:44" (1/3) ... [2020-08-18 20:24:45,229 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2114af85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:24:45, skipping insertion in model container [2020-08-18 20:24:45,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:44" (2/3) ... [2020-08-18 20:24:45,230 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2114af85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:24:45, skipping insertion in model container [2020-08-18 20:24:45,230 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:24:45" (3/3) ... [2020-08-18 20:24:45,232 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-08-18 20:24:45,247 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 20:24:45,255 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 20:24:45,277 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 20:24:45,313 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 20:24:45,313 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 20:24:45,313 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 20:24:45,314 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 20:24:45,314 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 20:24:45,314 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 20:24:45,314 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 20:24:45,314 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 20:24:45,340 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-18 20:24:45,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 20:24:45,348 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:45,349 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:45,350 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:45,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:45,358 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-08-18 20:24:45,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:45,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2137219908] [2020-08-18 20:24:45,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:45,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:45,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:45,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:45,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:45,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:45,648 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:45,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2137219908] [2020-08-18 20:24:45,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:24:45,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 20:24:45,653 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1352345939] [2020-08-18 20:24:45,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 20:24:45,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:45,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 20:24:45,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:24:45,677 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-18 20:24:45,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:45,850 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-18 20:24:45,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 20:24:45,852 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 20:24:45,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:45,864 INFO L225 Difference]: With dead ends: 59 [2020-08-18 20:24:45,864 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 20:24:45,868 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:24:45,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 20:24:45,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 20:24:45,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 20:24:45,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-18 20:24:45,918 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-18 20:24:45,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:45,919 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-18 20:24:45,919 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 20:24:45,920 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-18 20:24:45,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 20:24:45,921 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:45,921 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:45,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 20:24:45,922 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:45,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:45,923 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-08-18 20:24:45,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:45,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1209882070] [2020-08-18 20:24:45,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:45,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:46,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:46,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:46,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:46,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:46,177 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:46,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1209882070] [2020-08-18 20:24:46,178 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:24:46,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 20:24:46,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634398623] [2020-08-18 20:24:46,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 20:24:46,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:46,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 20:24:46,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:24:46,182 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-18 20:24:46,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:46,410 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-18 20:24:46,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 20:24:46,411 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-18 20:24:46,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:46,412 INFO L225 Difference]: With dead ends: 48 [2020-08-18 20:24:46,413 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 20:24:46,414 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:24:46,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 20:24:46,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 20:24:46,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 20:24:46,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-18 20:24:46,423 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-18 20:24:46,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:46,424 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-18 20:24:46,424 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 20:24:46,424 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-18 20:24:46,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 20:24:46,425 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:46,426 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:46,426 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 20:24:46,426 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:46,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:46,427 INFO L82 PathProgramCache]: Analyzing trace with hash -169907062, now seen corresponding path program 1 times [2020-08-18 20:24:46,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:46,428 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [349570832] [2020-08-18 20:24:46,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:46,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:46,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:46,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:46,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:46,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:46,629 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:46,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [349570832] [2020-08-18 20:24:46,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:46,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 20:24:46,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447032599] [2020-08-18 20:24:46,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 20:24:46,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:46,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 20:24:46,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:24:46,634 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-18 20:24:46,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:46,871 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-18 20:24:46,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 20:24:46,872 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-18 20:24:46,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:46,873 INFO L225 Difference]: With dead ends: 50 [2020-08-18 20:24:46,874 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 20:24:46,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:24:46,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 20:24:46,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 20:24:46,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 20:24:46,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-18 20:24:46,892 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-18 20:24:46,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:46,895 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-18 20:24:46,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 20:24:46,895 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-18 20:24:46,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 20:24:46,897 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:46,897 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:46,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 20:24:46,898 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:46,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:46,898 INFO L82 PathProgramCache]: Analyzing trace with hash -1071501364, now seen corresponding path program 2 times [2020-08-18 20:24:46,898 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:46,900 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [835285881] [2020-08-18 20:24:46,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:46,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:46,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:46,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:47,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:47,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:47,124 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:47,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [835285881] [2020-08-18 20:24:47,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:47,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 20:24:47,126 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162498617] [2020-08-18 20:24:47,126 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 20:24:47,127 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:47,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 20:24:47,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-18 20:24:47,128 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-18 20:24:47,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:47,282 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-18 20:24:47,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 20:24:47,282 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-18 20:24:47,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:47,284 INFO L225 Difference]: With dead ends: 52 [2020-08-18 20:24:47,284 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 20:24:47,285 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 20:24:47,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 20:24:47,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 20:24:47,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 20:24:47,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-18 20:24:47,291 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-18 20:24:47,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:47,292 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-18 20:24:47,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 20:24:47,292 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-18 20:24:47,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 20:24:47,293 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:47,293 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:47,294 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 20:24:47,294 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:47,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:47,294 INFO L82 PathProgramCache]: Analyzing trace with hash 79768206, now seen corresponding path program 3 times [2020-08-18 20:24:47,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:47,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [147846356] [2020-08-18 20:24:47,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:47,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:47,335 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:47,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:47,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:47,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:47,523 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:47,524 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [147846356] [2020-08-18 20:24:47,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:47,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 20:24:47,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126219180] [2020-08-18 20:24:47,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 20:24:47,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:47,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 20:24:47,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:24:47,527 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-18 20:24:47,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:47,718 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-18 20:24:47,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 20:24:47,719 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-18 20:24:47,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:47,720 INFO L225 Difference]: With dead ends: 54 [2020-08-18 20:24:47,720 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 20:24:47,721 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-18 20:24:47,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 20:24:47,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 20:24:47,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 20:24:47,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-18 20:24:47,728 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-18 20:24:47,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:47,728 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-18 20:24:47,728 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 20:24:47,728 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-18 20:24:47,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 20:24:47,729 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:47,730 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:47,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 20:24:47,730 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:47,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:47,730 INFO L82 PathProgramCache]: Analyzing trace with hash -1651737392, now seen corresponding path program 4 times [2020-08-18 20:24:47,731 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:47,731 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1504394427] [2020-08-18 20:24:47,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:47,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:47,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:47,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:47,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:47,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:47,968 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:47,969 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1504394427] [2020-08-18 20:24:47,969 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:47,969 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 20:24:47,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972652386] [2020-08-18 20:24:47,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 20:24:47,970 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:47,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 20:24:47,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:24:47,971 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-18 20:24:48,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:48,141 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-18 20:24:48,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 20:24:48,142 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-18 20:24:48,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:48,143 INFO L225 Difference]: With dead ends: 56 [2020-08-18 20:24:48,143 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 20:24:48,144 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:24:48,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 20:24:48,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 20:24:48,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 20:24:48,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-18 20:24:48,150 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-18 20:24:48,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:48,151 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-18 20:24:48,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 20:24:48,151 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-18 20:24:48,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 20:24:48,152 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:48,152 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:48,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 20:24:48,152 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:48,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:48,153 INFO L82 PathProgramCache]: Analyzing trace with hash 818693778, now seen corresponding path program 5 times [2020-08-18 20:24:48,153 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:48,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [844425821] [2020-08-18 20:24:48,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:48,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:48,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:48,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:48,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:48,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:48,459 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:48,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [844425821] [2020-08-18 20:24:48,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:48,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 20:24:48,461 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949343567] [2020-08-18 20:24:48,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 20:24:48,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:48,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 20:24:48,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 20:24:48,462 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-18 20:24:48,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:48,674 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-18 20:24:48,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 20:24:48,675 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 20:24:48,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:48,676 INFO L225 Difference]: With dead ends: 58 [2020-08-18 20:24:48,676 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 20:24:48,676 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-18 20:24:48,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 20:24:48,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 20:24:48,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 20:24:48,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-18 20:24:48,682 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-18 20:24:48,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:48,683 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-18 20:24:48,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 20:24:48,683 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-18 20:24:48,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 20:24:48,684 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:48,684 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:48,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 20:24:48,685 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:48,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:48,686 INFO L82 PathProgramCache]: Analyzing trace with hash -213866540, now seen corresponding path program 6 times [2020-08-18 20:24:48,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:48,686 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [68748199] [2020-08-18 20:24:48,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:48,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:48,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:48,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:48,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:48,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:49,014 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:49,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [68748199] [2020-08-18 20:24:49,014 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:49,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 20:24:49,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242318883] [2020-08-18 20:24:49,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 20:24:49,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:49,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 20:24:49,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-18 20:24:49,016 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-18 20:24:49,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:49,219 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-18 20:24:49,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 20:24:49,219 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-18 20:24:49,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:49,221 INFO L225 Difference]: With dead ends: 60 [2020-08-18 20:24:49,221 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 20:24:49,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-18 20:24:49,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 20:24:49,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 20:24:49,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 20:24:49,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-18 20:24:49,237 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-18 20:24:49,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:49,237 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-18 20:24:49,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 20:24:49,237 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-18 20:24:49,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 20:24:49,240 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:49,240 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:49,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 20:24:49,240 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:49,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:49,241 INFO L82 PathProgramCache]: Analyzing trace with hash -366886762, now seen corresponding path program 7 times [2020-08-18 20:24:49,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:49,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2082854604] [2020-08-18 20:24:49,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:49,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:49,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:49,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:49,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:49,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:49,656 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:49,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2082854604] [2020-08-18 20:24:49,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:49,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 20:24:49,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776761460] [2020-08-18 20:24:49,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 20:24:49,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:49,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 20:24:49,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:24:49,662 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-18 20:24:49,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:49,860 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-18 20:24:49,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 20:24:49,861 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-18 20:24:49,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:49,862 INFO L225 Difference]: With dead ends: 62 [2020-08-18 20:24:49,862 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 20:24:49,863 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-18 20:24:49,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 20:24:49,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 20:24:49,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 20:24:49,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-18 20:24:49,868 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-18 20:24:49,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:49,868 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-18 20:24:49,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 20:24:49,869 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-18 20:24:49,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 20:24:49,870 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:49,870 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:49,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 20:24:49,870 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:49,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:49,871 INFO L82 PathProgramCache]: Analyzing trace with hash -1390432040, now seen corresponding path program 8 times [2020-08-18 20:24:49,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:49,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1663461153] [2020-08-18 20:24:49,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:49,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:49,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:49,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:49,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:49,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:50,224 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:50,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1663461153] [2020-08-18 20:24:50,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:50,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 20:24:50,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457128862] [2020-08-18 20:24:50,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 20:24:50,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:50,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 20:24:50,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-18 20:24:50,226 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-18 20:24:50,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:50,467 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-18 20:24:50,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 20:24:50,468 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 20:24:50,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:50,469 INFO L225 Difference]: With dead ends: 64 [2020-08-18 20:24:50,469 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 20:24:50,471 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-18 20:24:50,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 20:24:50,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 20:24:50,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 20:24:50,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-18 20:24:50,483 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-18 20:24:50,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:50,483 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-18 20:24:50,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 20:24:50,484 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-18 20:24:50,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 20:24:50,485 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:50,490 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:50,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 20:24:50,490 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:50,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:50,491 INFO L82 PathProgramCache]: Analyzing trace with hash -1469933414, now seen corresponding path program 9 times [2020-08-18 20:24:50,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:50,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1144375668] [2020-08-18 20:24:50,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:50,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:50,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:50,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:50,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:50,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:50,577 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 20:24:50,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1144375668] [2020-08-18 20:24:50,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:24:50,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 20:24:50,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793562375] [2020-08-18 20:24:50,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:24:50,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:50,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:24:50,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:24:50,580 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-18 20:24:50,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:50,677 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-18 20:24:50,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 20:24:50,677 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-18 20:24:50,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:50,682 INFO L225 Difference]: With dead ends: 65 [2020-08-18 20:24:50,682 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 20:24:50,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:24:50,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 20:24:50,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-18 20:24:50,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 20:24:50,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-18 20:24:50,710 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-18 20:24:50,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:50,711 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-18 20:24:50,714 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:24:50,714 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-18 20:24:50,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 20:24:50,715 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:50,715 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:50,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 20:24:50,715 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:50,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:50,716 INFO L82 PathProgramCache]: Analyzing trace with hash -1568016950, now seen corresponding path program 1 times [2020-08-18 20:24:50,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:50,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1122700945] [2020-08-18 20:24:50,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:50,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:50,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:50,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:50,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:50,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:50,805 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 20:24:50,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1122700945] [2020-08-18 20:24:50,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:50,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 20:24:50,806 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2029658587] [2020-08-18 20:24:50,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 20:24:50,807 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:50,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 20:24:50,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:24:50,809 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-18 20:24:50,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:50,925 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-18 20:24:50,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 20:24:50,926 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-18 20:24:50,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:50,928 INFO L225 Difference]: With dead ends: 73 [2020-08-18 20:24:50,928 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 20:24:50,930 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:24:50,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 20:24:50,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-18 20:24:50,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 20:24:50,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-18 20:24:50,938 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-18 20:24:50,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:50,939 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-18 20:24:50,939 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 20:24:50,939 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-18 20:24:50,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 20:24:50,943 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:50,943 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:50,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 20:24:50,944 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:50,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:50,944 INFO L82 PathProgramCache]: Analyzing trace with hash 1298090650, now seen corresponding path program 2 times [2020-08-18 20:24:50,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:50,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [682015201] [2020-08-18 20:24:50,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:50,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:51,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:51,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:51,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:51,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:51,044 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-18 20:24:51,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [682015201] [2020-08-18 20:24:51,045 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:24:51,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 20:24:51,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805906268] [2020-08-18 20:24:51,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:24:51,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:51,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:24:51,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:24:51,046 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-18 20:24:51,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:51,134 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-18 20:24:51,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 20:24:51,134 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-18 20:24:51,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:51,135 INFO L225 Difference]: With dead ends: 69 [2020-08-18 20:24:51,135 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 20:24:51,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:24:51,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 20:24:51,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 20:24:51,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 20:24:51,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-18 20:24:51,141 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-18 20:24:51,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:51,142 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-18 20:24:51,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:24:51,142 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-18 20:24:51,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 20:24:51,143 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:51,143 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:51,143 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 20:24:51,143 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:51,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:51,144 INFO L82 PathProgramCache]: Analyzing trace with hash 318257626, now seen corresponding path program 1 times [2020-08-18 20:24:51,144 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:51,144 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [472555450] [2020-08-18 20:24:51,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:51,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:51,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:51,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:51,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:51,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:51,540 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:51,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [472555450] [2020-08-18 20:24:51,541 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:51,541 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 20:24:51,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275372271] [2020-08-18 20:24:51,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 20:24:51,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:51,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 20:24:51,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-18 20:24:51,542 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-18 20:24:51,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:51,776 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-18 20:24:51,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 20:24:51,777 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-18 20:24:51,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:51,778 INFO L225 Difference]: With dead ends: 74 [2020-08-18 20:24:51,778 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 20:24:51,779 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-18 20:24:51,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 20:24:51,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 20:24:51,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 20:24:51,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-18 20:24:51,785 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-18 20:24:51,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:51,785 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-18 20:24:51,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 20:24:51,786 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-18 20:24:51,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 20:24:51,786 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:51,786 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:51,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 20:24:51,787 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:51,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:51,787 INFO L82 PathProgramCache]: Analyzing trace with hash -935313508, now seen corresponding path program 2 times [2020-08-18 20:24:51,787 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:51,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898772171] [2020-08-18 20:24:51,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:51,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:51,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:51,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:51,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:51,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:52,252 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:52,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898772171] [2020-08-18 20:24:52,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:52,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 20:24:52,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281134573] [2020-08-18 20:24:52,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 20:24:52,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:52,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 20:24:52,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-18 20:24:52,254 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-18 20:24:52,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:52,468 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-18 20:24:52,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 20:24:52,469 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-18 20:24:52,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:52,469 INFO L225 Difference]: With dead ends: 76 [2020-08-18 20:24:52,470 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 20:24:52,470 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-18 20:24:52,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 20:24:52,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 20:24:52,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 20:24:52,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-18 20:24:52,475 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-18 20:24:52,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:52,476 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-18 20:24:52,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 20:24:52,476 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-18 20:24:52,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 20:24:52,477 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:52,477 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:52,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 20:24:52,477 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:52,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:52,478 INFO L82 PathProgramCache]: Analyzing trace with hash 1268636894, now seen corresponding path program 3 times [2020-08-18 20:24:52,478 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:52,478 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1879085155] [2020-08-18 20:24:52,478 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:52,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:52,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:52,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:52,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:52,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:53,037 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:53,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1879085155] [2020-08-18 20:24:53,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:53,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 20:24:53,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078341614] [2020-08-18 20:24:53,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 20:24:53,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:53,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 20:24:53,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-18 20:24:53,040 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-18 20:24:53,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:53,271 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-18 20:24:53,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 20:24:53,271 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 20:24:53,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:53,272 INFO L225 Difference]: With dead ends: 78 [2020-08-18 20:24:53,272 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 20:24:53,273 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-18 20:24:53,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 20:24:53,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 20:24:53,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 20:24:53,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-18 20:24:53,279 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-18 20:24:53,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:53,279 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-18 20:24:53,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 20:24:53,279 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-18 20:24:53,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 20:24:53,280 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:53,280 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:53,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 20:24:53,280 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:53,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:53,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1846096288, now seen corresponding path program 4 times [2020-08-18 20:24:53,281 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:53,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2139804141] [2020-08-18 20:24:53,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:53,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:53,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:53,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:53,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:53,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:53,869 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:53,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2139804141] [2020-08-18 20:24:53,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:53,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 20:24:53,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616929522] [2020-08-18 20:24:53,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 20:24:53,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:53,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 20:24:53,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-18 20:24:53,873 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-18 20:24:54,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:54,117 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-18 20:24:54,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 20:24:54,117 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-18 20:24:54,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:54,118 INFO L225 Difference]: With dead ends: 80 [2020-08-18 20:24:54,118 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 20:24:54,119 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-18 20:24:54,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 20:24:54,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 20:24:54,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 20:24:54,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-18 20:24:54,125 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-18 20:24:54,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:54,125 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-18 20:24:54,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 20:24:54,125 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-18 20:24:54,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 20:24:54,126 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:54,126 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:54,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 20:24:54,126 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:54,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:54,127 INFO L82 PathProgramCache]: Analyzing trace with hash -1561174558, now seen corresponding path program 5 times [2020-08-18 20:24:54,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:54,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [885321876] [2020-08-18 20:24:54,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:54,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:54,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:54,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:54,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:54,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:54,707 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:54,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [885321876] [2020-08-18 20:24:54,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:54,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 20:24:54,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088212129] [2020-08-18 20:24:54,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 20:24:54,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:54,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 20:24:54,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-18 20:24:54,716 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-18 20:24:54,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:54,980 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-18 20:24:54,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 20:24:54,981 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-18 20:24:54,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:54,981 INFO L225 Difference]: With dead ends: 82 [2020-08-18 20:24:54,982 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 20:24:54,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-18 20:24:54,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 20:24:54,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 20:24:54,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 20:24:54,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-18 20:24:54,988 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-18 20:24:54,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:54,989 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-18 20:24:54,989 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 20:24:54,989 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-18 20:24:54,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 20:24:54,989 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:54,990 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:54,990 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 20:24:54,990 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:54,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:54,990 INFO L82 PathProgramCache]: Analyzing trace with hash 1111589284, now seen corresponding path program 6 times [2020-08-18 20:24:54,992 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:54,992 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1039324382] [2020-08-18 20:24:54,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:55,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:55,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:55,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:55,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:55,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:55,672 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:55,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1039324382] [2020-08-18 20:24:55,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:55,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 20:24:55,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748326074] [2020-08-18 20:24:55,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 20:24:55,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:55,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 20:24:55,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-18 20:24:55,674 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-18 20:24:55,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:55,958 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-18 20:24:55,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 20:24:55,964 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-18 20:24:55,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:55,965 INFO L225 Difference]: With dead ends: 84 [2020-08-18 20:24:55,965 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 20:24:55,966 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-18 20:24:55,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 20:24:55,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 20:24:55,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 20:24:55,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-18 20:24:55,975 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-18 20:24:55,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:55,975 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-18 20:24:55,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 20:24:55,976 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-18 20:24:55,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 20:24:55,976 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:55,976 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:55,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 20:24:55,977 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:55,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:55,977 INFO L82 PathProgramCache]: Analyzing trace with hash 1247198438, now seen corresponding path program 7 times [2020-08-18 20:24:55,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:55,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473650591] [2020-08-18 20:24:55,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:56,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:56,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:56,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:56,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:56,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:56,784 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:56,785 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473650591] [2020-08-18 20:24:56,785 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:56,785 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 20:24:56,785 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013168589] [2020-08-18 20:24:56,787 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 20:24:56,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:56,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 20:24:56,788 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-18 20:24:56,788 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-18 20:24:57,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:57,010 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-18 20:24:57,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 20:24:57,011 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-18 20:24:57,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:57,011 INFO L225 Difference]: With dead ends: 86 [2020-08-18 20:24:57,012 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 20:24:57,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-18 20:24:57,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 20:24:57,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 20:24:57,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 20:24:57,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-18 20:24:57,019 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-18 20:24:57,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:57,019 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-18 20:24:57,019 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 20:24:57,019 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-18 20:24:57,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 20:24:57,020 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:57,020 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:57,020 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 20:24:57,021 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:57,021 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:57,021 INFO L82 PathProgramCache]: Analyzing trace with hash -1576390744, now seen corresponding path program 8 times [2020-08-18 20:24:57,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:57,021 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [92865855] [2020-08-18 20:24:57,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:57,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:57,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:57,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:57,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:57,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:57,880 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:57,881 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [92865855] [2020-08-18 20:24:57,881 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:57,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 20:24:57,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [909284633] [2020-08-18 20:24:57,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 20:24:57,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:57,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 20:24:57,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-18 20:24:57,887 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-18 20:24:58,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:58,148 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-18 20:24:58,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 20:24:58,149 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-18 20:24:58,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:58,149 INFO L225 Difference]: With dead ends: 88 [2020-08-18 20:24:58,150 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 20:24:58,150 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-18 20:24:58,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 20:24:58,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 20:24:58,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 20:24:58,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-18 20:24:58,158 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-18 20:24:58,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:58,159 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-18 20:24:58,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 20:24:58,159 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-18 20:24:58,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 20:24:58,161 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:58,161 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:58,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 20:24:58,161 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:58,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:58,162 INFO L82 PathProgramCache]: Analyzing trace with hash -626263574, now seen corresponding path program 9 times [2020-08-18 20:24:58,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:58,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [751863094] [2020-08-18 20:24:58,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:58,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:58,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:58,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:58,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:58,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:59,224 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:59,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [751863094] [2020-08-18 20:24:59,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:59,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 20:24:59,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678192212] [2020-08-18 20:24:59,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 20:24:59,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:59,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 20:24:59,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-18 20:24:59,226 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-18 20:24:59,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:59,536 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-18 20:24:59,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 20:24:59,540 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-18 20:24:59,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:59,541 INFO L225 Difference]: With dead ends: 90 [2020-08-18 20:24:59,541 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 20:24:59,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-18 20:24:59,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 20:24:59,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 20:24:59,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 20:24:59,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-18 20:24:59,546 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-18 20:24:59,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:59,546 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-18 20:24:59,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 20:24:59,547 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-18 20:24:59,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 20:24:59,547 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:59,548 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:59,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 20:24:59,548 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:59,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:59,548 INFO L82 PathProgramCache]: Analyzing trace with hash 1912880044, now seen corresponding path program 10 times [2020-08-18 20:24:59,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:59,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [354034647] [2020-08-18 20:24:59,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:59,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:59,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:59,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:59,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:59,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:00,435 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:00,435 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [354034647] [2020-08-18 20:25:00,436 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:00,436 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 20:25:00,436 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797642164] [2020-08-18 20:25:00,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 20:25:00,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:00,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 20:25:00,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-18 20:25:00,437 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-18 20:25:00,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:00,700 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-18 20:25:00,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 20:25:00,700 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-18 20:25:00,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:00,702 INFO L225 Difference]: With dead ends: 92 [2020-08-18 20:25:00,702 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 20:25:00,703 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-18 20:25:00,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 20:25:00,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 20:25:00,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 20:25:00,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-18 20:25:00,708 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-18 20:25:00,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:00,708 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-18 20:25:00,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 20:25:00,708 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-18 20:25:00,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 20:25:00,709 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:00,709 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:00,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 20:25:00,710 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:00,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:00,710 INFO L82 PathProgramCache]: Analyzing trace with hash -1806494482, now seen corresponding path program 11 times [2020-08-18 20:25:00,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:00,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [933163818] [2020-08-18 20:25:00,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:00,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:00,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:00,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:00,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:00,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:01,734 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:01,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [933163818] [2020-08-18 20:25:01,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:01,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 20:25:01,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569826150] [2020-08-18 20:25:01,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 20:25:01,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:01,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 20:25:01,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-18 20:25:01,739 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-18 20:25:02,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:02,090 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-18 20:25:02,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 20:25:02,091 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-18 20:25:02,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:02,092 INFO L225 Difference]: With dead ends: 94 [2020-08-18 20:25:02,092 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 20:25:02,093 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-18 20:25:02,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 20:25:02,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 20:25:02,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 20:25:02,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-18 20:25:02,098 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-18 20:25:02,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:02,098 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-18 20:25:02,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 20:25:02,099 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-18 20:25:02,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 20:25:02,099 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:02,099 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:02,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 20:25:02,100 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:02,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:02,100 INFO L82 PathProgramCache]: Analyzing trace with hash 1582343600, now seen corresponding path program 12 times [2020-08-18 20:25:02,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:02,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1654520707] [2020-08-18 20:25:02,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:02,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:02,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:02,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:02,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:02,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:03,083 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:03,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1654520707] [2020-08-18 20:25:03,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:03,083 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 20:25:03,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257123353] [2020-08-18 20:25:03,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 20:25:03,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:03,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 20:25:03,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-18 20:25:03,085 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-18 20:25:03,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:03,431 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-18 20:25:03,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 20:25:03,431 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-18 20:25:03,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:03,432 INFO L225 Difference]: With dead ends: 96 [2020-08-18 20:25:03,432 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 20:25:03,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-18 20:25:03,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 20:25:03,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 20:25:03,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 20:25:03,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-18 20:25:03,437 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-18 20:25:03,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:03,438 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-18 20:25:03,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 20:25:03,438 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-18 20:25:03,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 20:25:03,439 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:03,439 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:03,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 20:25:03,439 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:03,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:03,439 INFO L82 PathProgramCache]: Analyzing trace with hash -1624437262, now seen corresponding path program 13 times [2020-08-18 20:25:03,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:03,440 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [449340620] [2020-08-18 20:25:03,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:03,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:03,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:03,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:03,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:03,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:04,535 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:04,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [449340620] [2020-08-18 20:25:04,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:04,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 20:25:04,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884743131] [2020-08-18 20:25:04,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 20:25:04,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:04,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 20:25:04,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-18 20:25:04,538 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-18 20:25:04,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:04,765 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-18 20:25:04,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 20:25:04,766 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-18 20:25:04,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:04,767 INFO L225 Difference]: With dead ends: 98 [2020-08-18 20:25:04,767 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 20:25:04,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-18 20:25:04,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 20:25:04,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 20:25:04,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 20:25:04,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-18 20:25:04,774 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-18 20:25:04,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:04,774 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-18 20:25:04,774 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 20:25:04,774 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-18 20:25:04,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 20:25:04,775 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:04,775 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:04,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 20:25:04,775 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:04,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:04,776 INFO L82 PathProgramCache]: Analyzing trace with hash 445672884, now seen corresponding path program 14 times [2020-08-18 20:25:04,776 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:04,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [368556727] [2020-08-18 20:25:04,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:04,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:04,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:04,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:04,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:04,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:06,120 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:06,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [368556727] [2020-08-18 20:25:06,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:06,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 20:25:06,121 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886525171] [2020-08-18 20:25:06,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 20:25:06,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:06,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 20:25:06,122 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-18 20:25:06,122 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-18 20:25:06,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:06,454 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-18 20:25:06,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 20:25:06,455 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-18 20:25:06,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:06,456 INFO L225 Difference]: With dead ends: 100 [2020-08-18 20:25:06,456 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 20:25:06,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-18 20:25:06,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 20:25:06,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 20:25:06,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 20:25:06,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-18 20:25:06,461 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-18 20:25:06,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:06,461 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-18 20:25:06,461 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 20:25:06,461 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-18 20:25:06,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 20:25:06,462 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:06,462 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:06,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 20:25:06,462 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:06,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:06,463 INFO L82 PathProgramCache]: Analyzing trace with hash 1251665142, now seen corresponding path program 15 times [2020-08-18 20:25:06,463 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:06,463 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1412831360] [2020-08-18 20:25:06,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:06,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:06,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:06,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:06,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:06,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:07,707 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:07,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1412831360] [2020-08-18 20:25:07,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:07,707 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 20:25:07,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [200127618] [2020-08-18 20:25:07,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 20:25:07,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:07,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 20:25:07,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-18 20:25:07,710 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-18 20:25:08,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:08,077 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-18 20:25:08,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 20:25:08,077 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-18 20:25:08,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:08,078 INFO L225 Difference]: With dead ends: 102 [2020-08-18 20:25:08,078 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 20:25:08,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-18 20:25:08,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 20:25:08,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 20:25:08,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 20:25:08,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-18 20:25:08,084 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-18 20:25:08,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:08,084 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-18 20:25:08,085 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 20:25:08,085 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-18 20:25:08,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 20:25:08,085 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:08,085 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:08,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 20:25:08,086 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:08,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:08,086 INFO L82 PathProgramCache]: Analyzing trace with hash -1578855496, now seen corresponding path program 16 times [2020-08-18 20:25:08,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:08,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1009228330] [2020-08-18 20:25:08,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:08,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:08,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:08,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:08,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:08,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:09,305 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:09,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1009228330] [2020-08-18 20:25:09,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:09,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 20:25:09,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257104778] [2020-08-18 20:25:09,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 20:25:09,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:09,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 20:25:09,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-18 20:25:09,306 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-18 20:25:09,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:09,609 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-18 20:25:09,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 20:25:09,610 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-18 20:25:09,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:09,611 INFO L225 Difference]: With dead ends: 104 [2020-08-18 20:25:09,611 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 20:25:09,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 20:25:09,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 20:25:09,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 20:25:09,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 20:25:09,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-18 20:25:09,617 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-18 20:25:09,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:09,617 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-18 20:25:09,617 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 20:25:09,617 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-18 20:25:09,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 20:25:09,618 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:09,618 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:09,618 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 20:25:09,618 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:09,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:09,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1300077050, now seen corresponding path program 17 times [2020-08-18 20:25:09,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:09,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1920934570] [2020-08-18 20:25:09,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:09,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:09,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:09,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:09,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:09,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:10,945 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:10,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1920934570] [2020-08-18 20:25:10,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:10,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 20:25:10,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131413191] [2020-08-18 20:25:10,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 20:25:10,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:10,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 20:25:10,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-18 20:25:10,948 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-18 20:25:11,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:11,349 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-18 20:25:11,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 20:25:11,351 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-18 20:25:11,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:11,352 INFO L225 Difference]: With dead ends: 106 [2020-08-18 20:25:11,352 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 20:25:11,353 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 20:25:11,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 20:25:11,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 20:25:11,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 20:25:11,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-18 20:25:11,358 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-18 20:25:11,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:11,358 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-18 20:25:11,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 20:25:11,358 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-18 20:25:11,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 20:25:11,359 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:11,360 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:11,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 20:25:11,360 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:11,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:11,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1995315132, now seen corresponding path program 18 times [2020-08-18 20:25:11,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:11,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1353431121] [2020-08-18 20:25:11,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:11,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:11,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:11,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:11,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:11,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:12,800 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:12,800 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1353431121] [2020-08-18 20:25:12,801 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:12,801 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 20:25:12,801 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890966589] [2020-08-18 20:25:12,801 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 20:25:12,801 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:12,801 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 20:25:12,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-18 20:25:12,802 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-18 20:25:13,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:13,242 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-18 20:25:13,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 20:25:13,243 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-18 20:25:13,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:13,244 INFO L225 Difference]: With dead ends: 108 [2020-08-18 20:25:13,244 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 20:25:13,245 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 20:25:13,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 20:25:13,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 20:25:13,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 20:25:13,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-18 20:25:13,250 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-18 20:25:13,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:13,250 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-18 20:25:13,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 20:25:13,250 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-18 20:25:13,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 20:25:13,251 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:13,251 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:13,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 20:25:13,251 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:13,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:13,252 INFO L82 PathProgramCache]: Analyzing trace with hash 104213758, now seen corresponding path program 19 times [2020-08-18 20:25:13,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:13,252 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513977997] [2020-08-18 20:25:13,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:13,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:13,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:13,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:13,317 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:13,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:14,836 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:14,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513977997] [2020-08-18 20:25:14,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:14,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 20:25:14,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144616685] [2020-08-18 20:25:14,838 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 20:25:14,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:14,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 20:25:14,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 20:25:14,840 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-18 20:25:15,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:15,257 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-18 20:25:15,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 20:25:15,257 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-18 20:25:15,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:15,258 INFO L225 Difference]: With dead ends: 110 [2020-08-18 20:25:15,259 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 20:25:15,260 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 20:25:15,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 20:25:15,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 20:25:15,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 20:25:15,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-18 20:25:15,265 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-18 20:25:15,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:15,265 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-18 20:25:15,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 20:25:15,265 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-18 20:25:15,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 20:25:15,266 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:15,266 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:15,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 20:25:15,266 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:15,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:15,266 INFO L82 PathProgramCache]: Analyzing trace with hash -473040448, now seen corresponding path program 20 times [2020-08-18 20:25:15,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:15,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1649543263] [2020-08-18 20:25:15,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:15,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:15,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:15,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:15,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:15,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:16,925 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:16,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1649543263] [2020-08-18 20:25:16,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:16,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 20:25:16,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [652355126] [2020-08-18 20:25:16,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 20:25:16,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:16,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 20:25:16,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 20:25:16,927 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-18 20:25:17,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:17,382 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-18 20:25:17,383 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 20:25:17,383 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-18 20:25:17,383 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:17,384 INFO L225 Difference]: With dead ends: 112 [2020-08-18 20:25:17,384 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 20:25:17,385 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 20:25:17,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 20:25:17,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 20:25:17,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 20:25:17,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-18 20:25:17,389 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-18 20:25:17,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:17,389 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-18 20:25:17,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 20:25:17,390 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-18 20:25:17,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 20:25:17,390 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:17,390 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:17,391 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 20:25:17,391 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:17,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:17,391 INFO L82 PathProgramCache]: Analyzing trace with hash -1163551230, now seen corresponding path program 21 times [2020-08-18 20:25:17,391 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:17,392 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [116375779] [2020-08-18 20:25:17,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:17,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:17,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:17,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:17,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:17,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:19,151 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:19,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [116375779] [2020-08-18 20:25:19,152 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:19,152 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 20:25:19,152 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865091552] [2020-08-18 20:25:19,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 20:25:19,152 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:19,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 20:25:19,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 20:25:19,153 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-18 20:25:19,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:19,593 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-18 20:25:19,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 20:25:19,594 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-18 20:25:19,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:19,595 INFO L225 Difference]: With dead ends: 114 [2020-08-18 20:25:19,595 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 20:25:19,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 20:25:19,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 20:25:19,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 20:25:19,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 20:25:19,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-18 20:25:19,600 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-18 20:25:19,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:19,601 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-18 20:25:19,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 20:25:19,601 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-18 20:25:19,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 20:25:19,606 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:19,606 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:19,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 20:25:19,606 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:19,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:19,607 INFO L82 PathProgramCache]: Analyzing trace with hash 975518148, now seen corresponding path program 22 times [2020-08-18 20:25:19,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:19,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571772492] [2020-08-18 20:25:19,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:19,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:19,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:19,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:19,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:19,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:21,346 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:21,346 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571772492] [2020-08-18 20:25:21,346 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:21,346 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 20:25:21,347 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760752406] [2020-08-18 20:25:21,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 20:25:21,347 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:21,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 20:25:21,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 20:25:21,348 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-18 20:25:21,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:21,693 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-18 20:25:21,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 20:25:21,693 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-18 20:25:21,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:21,694 INFO L225 Difference]: With dead ends: 116 [2020-08-18 20:25:21,695 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 20:25:21,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 20:25:21,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 20:25:21,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 20:25:21,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 20:25:21,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-18 20:25:21,701 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-18 20:25:21,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:21,701 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-18 20:25:21,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 20:25:21,701 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-18 20:25:21,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 20:25:21,702 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:21,702 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:21,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 20:25:21,703 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:21,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:21,703 INFO L82 PathProgramCache]: Analyzing trace with hash -668144378, now seen corresponding path program 23 times [2020-08-18 20:25:21,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:21,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1714031754] [2020-08-18 20:25:21,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:21,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:21,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:21,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:21,772 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:21,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:23,601 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:23,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1714031754] [2020-08-18 20:25:23,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:23,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 20:25:23,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069064142] [2020-08-18 20:25:23,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 20:25:23,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:23,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 20:25:23,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 20:25:23,603 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-18 20:25:24,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:24,100 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-18 20:25:24,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 20:25:24,101 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-18 20:25:24,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:24,102 INFO L225 Difference]: With dead ends: 118 [2020-08-18 20:25:24,102 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 20:25:24,104 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 20:25:24,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 20:25:24,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 20:25:24,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 20:25:24,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-18 20:25:24,108 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-18 20:25:24,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:24,109 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-18 20:25:24,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 20:25:24,109 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-18 20:25:24,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 20:25:24,109 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:24,109 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:24,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 20:25:24,110 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:24,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:24,110 INFO L82 PathProgramCache]: Analyzing trace with hash 320133064, now seen corresponding path program 24 times [2020-08-18 20:25:24,110 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:24,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1303508529] [2020-08-18 20:25:24,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:24,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:24,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:24,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:24,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:24,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:26,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:26,132 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1303508529] [2020-08-18 20:25:26,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:26,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 20:25:26,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222370182] [2020-08-18 20:25:26,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 20:25:26,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:26,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 20:25:26,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 20:25:26,134 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-18 20:25:26,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:26,539 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-18 20:25:26,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 20:25:26,540 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-18 20:25:26,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:26,541 INFO L225 Difference]: With dead ends: 120 [2020-08-18 20:25:26,541 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 20:25:26,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 20:25:26,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 20:25:26,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 20:25:26,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 20:25:26,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-18 20:25:26,549 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-18 20:25:26,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:26,549 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-18 20:25:26,549 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 20:25:26,549 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-18 20:25:26,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 20:25:26,552 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:26,552 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:26,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 20:25:26,553 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:26,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:26,553 INFO L82 PathProgramCache]: Analyzing trace with hash 866982410, now seen corresponding path program 25 times [2020-08-18 20:25:26,553 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:26,553 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1048262899] [2020-08-18 20:25:26,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:26,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:26,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:26,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:26,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:26,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:28,658 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:28,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1048262899] [2020-08-18 20:25:28,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:28,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 20:25:28,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237620781] [2020-08-18 20:25:28,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 20:25:28,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:28,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 20:25:28,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 20:25:28,661 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-18 20:25:29,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:29,012 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-18 20:25:29,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 20:25:29,013 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-18 20:25:29,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:29,014 INFO L225 Difference]: With dead ends: 122 [2020-08-18 20:25:29,014 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 20:25:29,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 20:25:29,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 20:25:29,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 20:25:29,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 20:25:29,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-18 20:25:29,021 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-18 20:25:29,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:29,021 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-18 20:25:29,021 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 20:25:29,021 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-18 20:25:29,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 20:25:29,022 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:29,022 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:29,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 20:25:29,022 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:29,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:29,023 INFO L82 PathProgramCache]: Analyzing trace with hash -1891773492, now seen corresponding path program 26 times [2020-08-18 20:25:29,023 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:29,023 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [870864822] [2020-08-18 20:25:29,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:29,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:29,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:29,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:29,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:29,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:31,164 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:31,165 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [870864822] [2020-08-18 20:25:31,165 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:31,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 20:25:31,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071971647] [2020-08-18 20:25:31,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 20:25:31,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:31,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 20:25:31,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 20:25:31,166 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-18 20:25:31,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:31,498 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-18 20:25:31,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 20:25:31,499 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-18 20:25:31,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:31,500 INFO L225 Difference]: With dead ends: 124 [2020-08-18 20:25:31,500 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 20:25:31,502 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 20:25:31,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 20:25:31,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 20:25:31,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 20:25:31,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-18 20:25:31,507 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-18 20:25:31,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:31,507 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-18 20:25:31,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 20:25:31,507 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-18 20:25:31,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 20:25:31,508 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:31,508 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:31,508 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 20:25:31,509 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:31,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:31,509 INFO L82 PathProgramCache]: Analyzing trace with hash 1233593614, now seen corresponding path program 27 times [2020-08-18 20:25:31,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:31,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1652818583] [2020-08-18 20:25:31,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:31,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:31,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:31,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:31,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:31,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:33,853 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:33,853 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1652818583] [2020-08-18 20:25:33,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:33,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 20:25:33,854 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4571982] [2020-08-18 20:25:33,854 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 20:25:33,855 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:33,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 20:25:33,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 20:25:33,855 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-18 20:25:34,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:34,212 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-18 20:25:34,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 20:25:34,212 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-18 20:25:34,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:34,214 INFO L225 Difference]: With dead ends: 126 [2020-08-18 20:25:34,214 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 20:25:34,215 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 20:25:34,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 20:25:34,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 20:25:34,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 20:25:34,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-18 20:25:34,220 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-18 20:25:34,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:34,221 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-18 20:25:34,221 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 20:25:34,221 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-18 20:25:34,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 20:25:34,221 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:34,222 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:34,222 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 20:25:34,222 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:34,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:34,222 INFO L82 PathProgramCache]: Analyzing trace with hash -1765724720, now seen corresponding path program 28 times [2020-08-18 20:25:34,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:34,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [319107358] [2020-08-18 20:25:34,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:34,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:34,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:34,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:34,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:34,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:36,669 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:36,669 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [319107358] [2020-08-18 20:25:36,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:36,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 20:25:36,670 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845355208] [2020-08-18 20:25:36,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 20:25:36,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:36,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 20:25:36,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 20:25:36,671 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-18 20:25:37,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:37,127 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-18 20:25:37,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 20:25:37,128 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-18 20:25:37,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:37,130 INFO L225 Difference]: With dead ends: 128 [2020-08-18 20:25:37,130 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 20:25:37,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 20:25:37,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 20:25:37,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 20:25:37,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 20:25:37,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-18 20:25:37,137 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-18 20:25:37,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:37,138 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-18 20:25:37,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 20:25:37,138 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-18 20:25:37,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 20:25:37,139 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:37,139 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:37,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 20:25:37,140 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:37,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:37,140 INFO L82 PathProgramCache]: Analyzing trace with hash 2107379218, now seen corresponding path program 29 times [2020-08-18 20:25:37,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:37,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1580969422] [2020-08-18 20:25:37,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:37,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:37,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:37,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:37,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:37,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:39,668 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:39,669 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1580969422] [2020-08-18 20:25:39,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:39,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 20:25:39,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968046878] [2020-08-18 20:25:39,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 20:25:39,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:39,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 20:25:39,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 20:25:39,671 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-18 20:25:40,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:40,266 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-18 20:25:40,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 20:25:40,267 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-18 20:25:40,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:40,269 INFO L225 Difference]: With dead ends: 130 [2020-08-18 20:25:40,269 INFO L226 Difference]: Without dead ends: 108 [2020-08-18 20:25:40,270 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 20:25:40,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-18 20:25:40,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-18 20:25:40,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 20:25:40,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-18 20:25:40,277 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-18 20:25:40,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:40,277 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-18 20:25:40,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 20:25:40,278 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-18 20:25:40,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 20:25:40,281 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:40,281 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:40,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 20:25:40,281 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:40,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:40,282 INFO L82 PathProgramCache]: Analyzing trace with hash 423618004, now seen corresponding path program 30 times [2020-08-18 20:25:40,282 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:40,282 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1443523569] [2020-08-18 20:25:40,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:40,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:40,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:40,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:40,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:40,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat